4877617
Descrição
FlashCards por Bee Brittain, atualizado more than 1 year ago
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Criado por Bee Brittain
mais de 8 anos atrás
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| Questão | Responda |
| Unsaturated alkenes go through what type of polymerisation? | Addition polymerisation |
| Is the molecular mass of a polymer high or low? | High |
| The addition polymerisation of alkenes produces long what? | Long Unsaturated Chains |
| Polymers are mainly plastics. Plastics can be BURNED, give one advantage to burning plastics | The heat generated can be used to generate electricity (heats up water --> steam turns turbines -> electricity generated) |
| What is a disadvantage and a precaution taken with it, when BURNING plastics? | Burning plastics gives off toxic gases. E.g/ if a polymer contains Cl, it will release HCl when burned. The precaution taken is that waste gases pass through 'scrubbers' which react toxic gases like HCl with a base, in order to neutralise them. |
| Waste plastics can also be BURIED when it is too technically difficult to recycle or when... | When separating plastics is too difficult, or when the waste is not in sufficient quantities to make sorting worth while |
| Give a disadvantage with BURYING waste | Because burying plastics means landfill and the sheer amount of waste we produce is becoming a problem and landfill needs to be reduced |
| Waste plastics can also be REUSED, name 2 different ways that (after sorting), plastics can be reused | They can be melted and remoulded into a different shape. Or, some polymers can be cracked back into their original monomers and used as ORGANIC FEEDSTOCK to make more plastics/chemicals |
| Why is Feedstock Recycling a good way to recycle easily? | it is able to handle unwashed or unsorted polymers |
| What is a biodegradable polymer? | A biodegradable polymer is a polymer that, in the right conditions, can be decomposed quickly as they are digested by living organisms |
| Name 3 examples of what a biodegradable polymer can be made from: | 1) Starch 2) Proteins 3) Cellulose |
| Before biodegradable polymers can be left to decompose, what has to happen to them? | They have to be sorted and separated from any non-biodegradable polymers |
| Give an example of a use for a biodegradable plastic | Plastic sheeting to protect plants from frost - sheeting is embedded with starch granules, so over time the starch gets broken down by microorganisms, and the remaining polyethene turns to dust |
| A photodegradable polymer decomposes when exposed to what? | Light |
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